md2tex

#!/usr/bin/env sh
# vim: ft=sh ts=4 sw=4 sts=4 et :

# Get absolute path without using realpath/readlink
abs_path() {
    case "$1" in
    /*) printf '%s\n' "$1" ;;
    *) printf '%s/%s\n' "$PWD" "$1" ;;
    esac
}

md2tex() {
    pandoc \
        --standalone \
        -f markdown-implicit_figures \
        -t latex \
        "$1" \
        -o "${1%.md}.tex"
}

main() {
    if [ $# -eq 0 ]; then
        echo "Error: no input files" >&2
        printf "Usage: %s files...\n" "$(basename "$0")" >&2
        exit 1
    fi

    for file in "$@"; do
        oldpwd=$PWD

        # Pictures in markdown cannot be fetched if we are not in the same
        # directory
        cd "$(dirname "$(realpath "$file")")" >/dev/null 2>&1 || exit 1

        if ! md2tex "$(basename "$file")"; then
            rc=$?
            echo "md2tex: error: pandoc failed to convert '$file' with exit code $rc" >&2
            cd "$oldpwd" >/dev/null 2>&1
            exit $rc
        fi

        cd "$oldpwd" >/dev/null 2>&1
    done
}

main "$@"